One of the mysteries of the English language finally explained.
With reference to a bloodletting procedure: to the point at which the patient feels faint or faints (from loss of blood).
Late 17th century; earliest use found in John Fryer (d. 1733), traveller and writer. From post-classical Latin ad deliquium to unconsciousness from classical Latin ad + dēliquium, in post-classical Latin sense ‘fainting’.
ad deliquium/ˌad dɪˈlɪkwɪəm/
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